Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flow from operating activities:
Net income	$ 9,555	$ 17,765
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation	13,565	11,345
Amortization	10,808	11,042
Equity earnings from unconsolidated affiliate, net of distributions	(1,153)	(120)
Amortization of deferred financing costs	1,258	1,145
Unit-based compensation	1,847	3,523
Net loss (gain) on revaluation of contingent consideration	1,465	(303)
Net loss (gain) on disposal of property and equipment	1,484	0
Changes in operating assets and liabilities:
Trade accounts receivable	(3,125)	583
Due from related parties	841	(34)
Inventories	29	80
Other current assets	(384)	(442)
Accounts payable	952	(573)
Accrued expenses	295	(227)
Due to general partner	680	1,347
Other liabilities	428	(1,829)
Net cash provided by (used in) operating activities	38,545	43,302
Cash flows from investing activities:
Capital expenditures	(12,966)	(20,902)
Investment in unconsolidated affiliate	(6)	0
Net cash paid for acquisitions	0	(8,000)
Net cash provided by (used in) investing activities	(12,972)	(28,902)
Cash flows from financing activities:
Distributions	(25,758)	(25,438)
Deferred financing costs	(213)	(584)
Repayments to credit facility	(15,000)	(3,313)
Proceeds from credit facility	22,000	23,250
Equity contribution from non-controlling interests	1,575	0
Payments of earn-out liability	(2,153)	(1,028)
Distributions paid to non-controlling interests	(7,200)	(8,000)
Net settlement withholding taxes related to stock based compensation	(202)	0
Distribution equivalent rights paid on unissued units	(529)	(763)
Net cash provided by (used in) financing activities	(27,480)	(15,876)
Net increase (decrease) in cash and cash equivalents	(1,907)	(1,476)
Cash and cash equivalents, beginning of period	4,584	5,870
Cash and cash equivalents, end of period	2,677	4,394
Supplemental disclosure of cash flow information:
Cash paid for interest	7,390	6,601
Cash paid for income taxes	86	100
Non-cash investing and financing activities:
Decrease (increase) in earn-out liability in accounts payable and accrued expenses	(288)	0
Increase (decrease) in purchases of property plant and equipment in accounts payable and accrued expenses	$ 2,890	$ (1,365)